Not comparably. Gerry was the only shooter on those teams. Both he and Buddy forced shots. JJ is a lot more open than both shooting that percentage. Maybe he will improve and prove me wrong.
To add some context, JJ took 4.9 3's per 40 minutes last season (6.8 per 100 possessions). Gerry for his career took 9.4 3's per 40 minutes (Bbref doesnt have per 100 numbers going that far back, but I am going to estimate it at around 15 3's per 100 possessions). Gerry took a ton more 3's than Starling did. Obviously its a lot harder to carry a higher percentage the more you take. Buddy took about 12.5 3's per 100 possessions.
I took a look at all player basketball reference had coded as guards who made at least 30 3's last year (JJ was 46). There were 964 players who showed up in my search. JJ was 784th among them in 3 pointers attempted per 36. If you looked at all the guys who were within 1 3PA per 40 of him (IE, anyone who took between 4.5 and 5.5 3's per 40, the average % of that group (168 players) was 35.2%. That's just the simple average, not weighted by attempts.
Consider this all a long way of saying considering his volume, I dont think you can argue his shooting% from 3 was good at all.
Another note on Gerry; it 2005 he took 63.1% of our 3 pointers. I dont know an easy way to compare that, but I have to imagine that is very close to the highest percentage of team 3PA one guy is responsible for this century. He lead the country in 3PA that season, just going quickly through the rest of the top 5 this is the % of team 3PA they were responsible for
2) Pat Carroll, St Joes, 41.9%
3) JJ Redick, you know where, 39.3%
4) Keydren Clark, St. Peters, 46.3%,
5) Brendan Plavich, Charlotte, 46.7%
One final piece of context, the rest of our roster in 2005 took 184 3PA all season. There were 59 players during the 2005 season who took at least 184 3PA on their own.